. So maybe when our separate paths lead us out of childhood, our roads will converge, and we’ll be together again.
This shows something about their relationship dynamic and how she hopes things go in the future. She knows that right now they don't understand each other, but hopes that in the future they can come to understand each other when they're older.
. I go back to my room where the carpet is red and cut into pictures of bricks. I hop on the bricks and play with my dolls—stuffed unicorns and bears and rabbits, all with the same tea-stained mouths.
The contrast between the very serious scene of the broken glass and records and police officers and the playful and childish room of the girl is almost like a visual representation of how desperately she tried to understand her brother, but at the end of the day she was still just a child. The thin wall was still separating them.
and the window is shattered and he’s long gone. The floor is littered with broken records.
this shows the mess of the room, but also conveys the emotions they likely felt, not just her and her mom from the brother having left, but also the way he probably felt as he decided to leave.
I lie on my back, hands laced behind my head and eyes closed because I know that’s exactly what he’s doing.
The imagery of the two siblings, in their separate rooms separated by the thin wall, the little sister mimicking her brother shows how she was trying to understand him and his music.
the tinsel rain of cymbals
the author uses this imagery to get the reader to understand the kind of music she heard.